Chemistry 5070 · O Level · The characteristic properties of acids and bases

The characteristic properties of acids and bases — practice question

Solution X is introduced to a solid salt, so that gas Y is given off. Gas Y dissolves in water, forming a solution with a pH below $7$. What could X and Y be?

  • AX: aqueous sodium hydroxide; Y: ammonia
  • BX: aqueous sodium hydroxide; Y: carbon dioxide
  • CX: dilute hydrochloric acid; Y: ammonia
  • DX: dilute hydrochloric acid; Y: carbon dioxide

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